 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.dialogs;

 import org.eclipse.jface.viewers.AbstractTreeViewer;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerFilter;
 import org.eclipse.ui.wizards.IWizardDescriptor;

 /**
  * A viewer filter that will exclude all IWizardDescriptors that do not have at
  * least one tag in a provided set.
  *
  * @since 3.1
  */
 public class WizardTagFilter extends ViewerFilter {

     private String [] myTags;
     
     /**
      * Create a new instance of this filter
      * @param tags the wizard tags to allow
      */
     public WizardTagFilter(String [] tags) {
         myTags = tags;
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.jface.viewers.ViewerFilter#select(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
      */
     public boolean select(Viewer viewer, Object parentElement, Object element) {
         if (element instanceof IWizardDescriptor) {
             IWizardDescriptor desc = (IWizardDescriptor)element;
             String [] tags = desc.getTags();
             for (int i = 0; i < tags.length; i++) {
                 for (int j = 0; j < myTags.length; j++) {
                     if (tags[i].equals(myTags[j])) {
                         return true;
                     }
                 }
             }
             return false;
         }
         Object [] children = ((ITreeContentProvider) ((AbstractTreeViewer) viewer)
                 .getContentProvider()).getChildren(element);
         if (children.length > 0) {
             return filter(viewer, element, children).length > 0;
         }

         return false;
     }
 }

